in Delphi TIPS :: In Delphi, the NIL constant (also a reserved word) is a pointer value defined as "not-assigned" or "pointer to nothing" or "undetermined". Understand NIL before you use it...

Read the full article to learn about Delphi's NIL value and the Assigned RTL Function.

Related:

• Understanding and Using Pointers in Delphi
• Creating Components Dynamically (at Run-Time)
• TForm.Create(?) Nil, Self or Application?

in Delphi TIPS :: Windows defines special constants for each key the user can press. The virtual-key codes identify various virtual keys. These constants can then be used to refer to the keystroke when using Delphi and Windows API calls or in an OnKeyUp or OnKeyDown event handler.

Read the full article to learn how to Convert a Virtual Key Code to a Character.

Related:

• Virtual Key Codes
• Understanding and Processing Keyboard events in Delphi
• Programmatically Get and Set the State of the CapsLock and NumLock Keys

Service applications take requests from client applications, process those requests, and return information to the client applications. They typically run in the background, without much user input. Services can be automatically started when the computer boots, can be paused and restarted, and do not show any user interface.

Read the full article to learn about Creating Windows Service Applications Using Delphi

Related:

• Tools You Need Before You Start a New Delphi Project
• Windows, Shell, API programming with Delphi
• Developing (and consuming) Web Services with Delphi

in Delphi VCL :: You might need to programmatically grab the screen shot of the current page loaded in the web browser control. A custom Delphi function WebBrowserScreenShot will capture the contents of a TWebBrower's client area into a JPEG image and save it to a specified file.

Read the full article to learn how to Capture a Screen Shot of a TWebBrowser Content (Web Page) in Delphi.

Related:

• Capturing screen shots including the mouse cursor
• Convert a BMP to a JPG
• WebBrowser to the MAX